Golang의 멀티캐스트 UDP 연결에서 IP_MULTICAST_LOOP를 설정하는 방법은 무엇입니까?

package main

import (
    "fmt"
    "net"
    "golang.org/x/net/ipv4"
)

func main() {
    // IPv4 address for multicast
    ipv4Addr := &net.UDPAddr{IP: net.IPv4(224, 0, 0, 251), Port: 5352}

    // Dial a UDP connection
    conn, err := net.ListenUDP("udp4", ipv4Addr)
    if err != nil {
        fmt.Printf("Error dialing: %v\n", err)
        return
    }

    // Create a packet connection from the UDP connection
    pc := ipv4.NewPacketConn(conn)

    // Assume an interface named "wlan"
    iface, err := net.InterfaceByName("wlan")
    if err != nil {
        fmt.Printf("Could not find interface %v\n", err)
        return
    }

    // Join the multicast group on the specified interface
    if err = pc.JoinGroup(iface, &net.UDPAddr{IP: net.IPv4(224, 0, 0, 251)}); err != nil {
        fmt.Printf("Failed to join multicast group: %v\n", err)
        return
    }

    // Get and set multicast loopback status
    loop, err := pc.MulticastLoopback()
    if err != nil {
        fmt.Printf("Failed to get multicast loopback status: %v\n", err)
    }

    fmt.Printf("Multicast loopback status: %v\n", loop)

    if !loop {
        if err = pc.SetMulticastLoopback(true); err != nil {
            fmt.Printf("Could not set multicast loopback: %v\n", err)
            return
        }
    }

    // Send a message on the multicast address
    if _, err = conn.WriteTo([]byte("hello"), ipv4Addr); err != nil {
        fmt.Printf("Error sending multicast message: %v\n", err)
    }

    // Reading multicast messages
    buf := make([]byte, 1024)
    for {
        n, addr, err := conn.ReadFrom(buf)
        if err != nil {
            fmt.Printf("Error in multicast message reception: %v\n", err)
        }
        fmt.Printf("Message received: %s from %v\n", buf[:n], addr)
    }
}